Mercedes-Benz C-Class (W203; 2000-2007) fuses and relays

 

In this article, we consider the second-generation Mercedes-Benz C-Class (W203), produced from 2000 to 2007. Here you will find fuse box diagrams of Mercedes-Benz C160, C180, C200, C220, C230, C240, C270, C280, C320, C350, C30, C32, C50 2000, 2001, 2002, 2003, 2004, 2005, 2006 and 2007, get information about the location of the fuse panels inside the car, and learn about the assignment of each fuse (fuse layout) and relay.

Fuse Layout Mercedes-Benz C-Class 2000-2007


Cigar lighter (power outlet) fuses in the Mercedes-Benz C-Class are the fuse #47 (Front cigar lighter) in the Engine Compartment Fuse Box, and fuse #12 (Interior socket / Power outlet) in the Luggage Compartment Fuse Box.


Instrument Panel Fuse Box

Fuse box location

The fuse box is located on the driver’s side edge of the instrument panel, behind the cover.The location of the fuses in the passenger compartment: Mercedes-Benz C-Class (W203; 2000-2007)

Fuse box diagram

Instrument panel fuse box diagram: Mercedes-Benz C-Class (2000-2007)

 

Assignment of the fuses in the instrument panel

Circuit protected Amp
21 Left front door control unit 30
22 Right front door control unit 30
23 Up to 30.11.04: Central gateway control unit 15
24 CD player with changer (in glove compartment) 7.5
25 Upper control panel control unit 30
26 Sound amplifier 25
27 Driver-side front seat adjustment control unit, with memory
Special vehicle multifunction control unit (SVMCU [MSS])
30
28 Spare 30
29 Driver-side front seat adjustment control unit, with memory
Driver-side front seat adjustment control unit, with memory
Special vehicle multifunction control unit
30
30 Heating systems recirculation unit 40
31 EIS [EZS] control unit
Electric steering lock control unit
20
32 Left rear door control unit 30
33 Right rear door control unit  30
34 Cell phone separation point
up to 31.5.01:
Telephone and TELE AID transmitter/receiver, D2B
Telephone transmitter and receiver unit, D2B
Telephone interface
E-net compensator
up to 31.5.01, Japan version: E-call control unit
7.5
34 up to 31.3.04: Front passenger front seat adjustment control unit with memory
as of 1.4.04: Passenger-side front seat adjustment control unit with memory
up to 31.5.03, Taxi: Special vehicle multifunction control unit
as of 1.6.03, Taxi: Special vehicle multifunction control unit
as of 1.6.01, Police: Special vehicle multifunction control unit
15
34 as of 1.4.04: Front passenger front seat adjustment control unit with memory
as of 1.4.04, Taxi: Special vehicle multifunction control unit
30
35 up to 31.3.04 : STH heater unit 30
35 as of 1.4.04 : STH heater unit  20
36 up to 31.3.04, Police:  Interior socket  30
36 Valid for engine (612.990) (up to 29.2.04): Charge air cooler circulation pump
as of 1.4.04, Japan version: Audio gateway control unit
15
36 Universal Portable CTEL Interface (UPCI [UHI]) control unit  7.5
37 Charge air cooler circulation pump
up to 29.2.04: Brake booster vacuum pump control unit
25
38 up to 29.2.04:Passenger-side front seat adjustment control unit with memory
as of 1.4.04, Police:Special vehicle multifunction control unit (SVMCU [MSS])
30
39 Spare 30
40 Passenger-side front seat adjustment control unit with memory
Universal Portable CTEL Interface (UPCI [UHI]) control unit
Cell phone separation point
Telephone interface
E-net compensator
as of 1.6.01, MB standard telephone: Telephone transmitter and receiver unit, D2B
as of 1.6.01, TELE AID: Telephone and TELE AID transmitter/receiver, D2B
as of 1.6.01, Canadian vehicles: Via the trunk lid/FFS [RBA] separation point the trunk lid emergency release switch and the rear SAM control unit with fuse and relay module
USA version: Via the trunk lid/FFS [RBA] separation point the trunk lid emergency release switch and the rear SAM control unit with fuse and relay module
as of 1.4.04, Japan version: E-call control unit
7.5
40 up to 31.5.01:  Special vehicle multifunction control unit 30
41 HEAT control and operating unit
up to 31.5.01:
AAC [KLA] control and operating unit
Comfort AAC [kLa] control and operating unit
7.5
41 as of 1.6.01:
AAC [KLA] control and operating unit
Comfort AAC [KLA] control and operating unit
15
42 Instrument cluster 7.5

Engine Compartment Fuse Box

Fuse box location

The fuse box is located in the engine compartment (left-side), under the cover.The location of the fuses in the engine compartment: Mercedes-Benz C-Class (2000-2007)

Fuse box diagram

Under-hood fuse box diagram: Mercedes-Benz C-Class (2000-2007)

Assignment of the fuses and relay in the engine compartment

Circuit protected Amp
43a Fanfare horn relay 15
43b Fanfare horn relay 15
44 Telephone and TELE AID transmitter/ receiver, D2B
Telephone transmitter and receiver unit, D2B
Cell phone separation point
5
45 Restraint systems control unit 7.5
46 Wiper ON/OFF relay
Wiper speed 1 and 2 relay
40
47 Glove compartment illumination with switch
Front cigar lighter (with illumination)
15
48 Valid for engine 612.990 (up to 31.3.04): Brake booster vacuum pump control unit
Valid for engine 112 and engine 113: Circuit 15 connector sleeve (fused)
Valid for engine 646, USA version (up to 31.3.04): Circuit 30 connector sleeve
Valid for engine 646 (as of 1.4.04): O 2 sensor upstream of TWC [kAt] connector
15
49 Restraint systems control unit 7.5
50 Light switch module
Valid for engine 612.990: Glow output stage (up to 31.3.04), Hot film mass air flow sensor (1.4.04 up to 30.11.04)
5
51 AAC with integrated control additional fan motor
Instrument cluster
Valid for code (581) comfort automatic air conditioning: C-AAC [K-KLA] multifunction sensor, C-AAC [K-KLA] sun sensor (4 in total), Left front lamp unit, Right front lamp unit
Valid for AMG vehicles: Charge air cooler circulation pump
Valid for model 203.0 (up to 31.7.01): SPS [PML] control unit
7.5
52 Starter 15
53 Starter relay
Rear SAM control unit with fuse and relay module
Valid for engine 611/612/642/646: CDI control unit
25
53 Valid for gasoline engines:
Starter relay
Rear SAM control unit with fuse and relay module
Valid for engine 111/271/272: ME-SFI [ME] control unit
Valid for engine 112/113:
ME-SFI [ME] control unit
Circuit 87M1e connector sleeve
15
54 Valid for engine 271.940:
ME-SFI [ME] control unit
Purge control valve (USA version)
Activated charcoal canister shutoff valve
Valid for engine 271.942: NOX (nitrogen oxides) control unit
Valid for engine 642/646: CDI control unit
Valid for engine 642/646: Circuit 30 connector sleeve
15
54 Valid for engines 611/612: CDI control unit
Valid for engine 611/612 (up to 30.11.04): Vent line heater element
7.5
55 Steering angle sensor
Distronic: DTR control unit
Valid for transmission 722:
ETC [EGS] control unit (up to 31.5.04)
Electronic selector lever module control unit
Electric controller unit (VGS)
Valid for transmission 716:
Gear recognition switch
Automated manual transmission control unit
7.5
56 ESP and BAS control unit
Stop light switch
5
57 Steering angle sensor (up to 31.5.02)
EIS [EZS] control unit
Steering column module (as of 1.6.02)
Valid for engine 112/113: ME-SFI [ME] control unit
5
58 Valid for transmission 716: SEQ hydraulic pump 40
59 ESP and BAS control unit 50
60 ESP and BAS control unit 40
61 Valid for transmission 716: Automated manual transmission control unit 15
62 Data link connector
Light switch module
Stop light switch
5
63 Light switch module 5
64 Radio
Radio and navigation unit
COMAND operating, display and control unit
10
65 Valid for engine 112/113: Electric air pump 40
Relay
I Fanfare horn system relay
K Terminal 87 relay, chassis
L Wiper speed 1 and 2 relay
M Terminal 15R relay
N SEQ [ASG] pump control relay (with Sequentronic automated manual transmission (ASG))
O Air pump relay (engines 112, 113, 271 only)
P Terminal 15 relay
Q Wiper ON/OFF relay
R Terminal 87 relay, engine
S Starter relay

Front Prefuse Box

Circuit protected Amp
1 Interior fusebox 125
2 Luggage fusebox 200
3 Additional fuse holder 1, spare wheel well 125
4 Engine fusebox 200
5 Engine and AC electric suction fan with integrated control
Valid for diesel engines: Glow output stage
125
6 Engine fusebox 60

Luggage Compartment Fuse Box

Fuse box location

The fuse box is located in the luggage compartment (on the left-side), behind the cover.The location of the fuses in the trunk: Mercedes-Benz C-Class (W203; 2000-2007)

Fuse box diagram

 

Assignment of the fuses and relay in the trunk

Circuit protected Amp
1 Front passenger front seat adjustment control unit with memory
Front passenger partially-electric seat adjustment switch
30
2 Driver front seat adjustment control unit with memory
Driver partially-electric seat adjustment switch
30
3 Dome lamp
Right luggage compartment lamp
Left luggage compartment lamp
STH radio remote control receiver
7.5
3 TV tuner (up to 29.2.04)
TV tuner (MOST) (as of 1.4.04)
20
4 Fuel pump relay (N10/2kA) 20
5 Valid for engine 112.961 (up to 31.3.04): Charge air cooler circulation pump

Valid without engine 112.961: Backup relay 2

20
6 Spare 25
7 Backup relay 1 7.5
8 Amplifier module, window antenna
Alarm signal horn (H3) ATA [EDW] inclination sensor
7,5
9 Overhead control panel control unit 25
10 Heated rear window 40
11 Spare 20
12 Interior socket
Valid for model 203.0 USA version (up to 31.3.04): Power outlet
15
13 Multicontour seat pneumatic pump
Voice control system control unit
Rear dome lamp
Rear dome lamp PTS warning indicator
PTS control unit
Japan version: VICS+ETC voltage supply separation point.
5
14 Tailgate wiper motor 15
15 Fuel filler cap polarity change relay 1
Fuel filler cap polarity change relay 2
10
16 Voice control system control unit 20
17 Trailer recognition control unit 20
18 Trailer hitch socket (13-pin) 20
19 Multicontour seat pneumatic pump 20
20 Rear window roller blind relay
Valid for model 203.2/7 USA version: Power outlet
15
Relay
A Fuel pump relay
B Relay 2, terminal 15R
C Reserve relay 2
D Reserve relay 1
E Rear window defroster relay
F Relay 1, terminal 15R
G Filler cap relay, polarity reverser 1
H Filler cap relay, polarity reverser 2


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